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R. G. LAWRY.

COMBINED SCREEN AND PICKING TYABEE.

APPLICATION FILED APR. 30, I920.

Patented June 14, 1921;

2 SHEETS-SHEET I.

[72716 niar fay 072d 61 law/r Wm RA'YIMON'D G. LAWRY, OF CHICAGO, ILLINOIS, ASSIGNOR '1 O ROBERTS & SCHAEFER COMPANY, or CHICAGO, rumors, A CORPORATION or ILLINOIS.

COMBINED SCREEN AND PICKING-TABLE.

Specification of Letters Patent. I Patented June 14, 1921 Application filed April 30, 1920. Serial No. 377,836.

To all whom it may concern:

Be it known that-I, RAYMOND G. LAWRY, a citizen of the United States; residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Combined Screens.

and Picking-Tables, of which the following is a specification.

My invention relates to improvements in combined screen and picking tables and used in connection with coal and the like handling and separating devices. 0

My device is peculiarly adapted for use in connection with the Marcus screen, but of course can be advantageously used in connection with many other types of screens and coal and material handling apparatuses.

Experience has shown that about 5 feet is the maximum permissible width for a igging table, because if the width is greater than that then the operator begins to have a great deal of trouble reaching over and getting at the material to pick the refuse as the material goes by, and in the past the capacity of screening plants has been limited by this limitation on the width of the screen and picking table.

y my invention I propose to obviate this difliculty by dividing the large sized screen into a plurality of separate smaller combined screens and picking tables which will all be in parallelism with one another and each one of these small screens will be of such size that the operator can easily reach far enough to do efi'ective picking.

In the modified form shown in Figure 6.

I show a section of a screen wherein the upper and the lower surfaces are separately hung.

My invention is illustrated more or less diagrammatically in the accompanying drawings. wherein:

Fig. 1 is a diagrammatic plan view;

Fig. 2 is a side elevation;

Fig. 3 is a section along the line 33 of Fig. 1

Fig. 4 is a section. along the line 1-4 of Fit. 1;

Fig. 5. is a section along the line 55 of I slightly modified form of the screen;

A is the screen table.

Fig. 7 is the driving head by which the upper and lower screen branches move in opposite direction so that they are in balance and the work done by the driving apparatus 1s reduced.

Like parts are indicated by like characters in all the figures.

A- is a chute through which coal from the mlne is discharged on to my screen table. It is supported on pivoted hangers A A and is adapted to be oscillated by an eccentric driving head A driven from any suitable source of power.

The screen frame'is madeup of a solid bottom B having upwardly extending side walls B These side walls support the screen'B the idea being that the material as the screen is reciprocated will pass down along the screen, the fine particles passing through the screen into the lower floor, the coarse particles passing along over the screen. It will be understood that the screen 1s not continuous throughout the entire length of the apparatus.

operator cannot reach far enough in to do satisfactory work. This wide part of the screen is indicated at C. Slightly removed from the head end the wide screen is separated finto two relatively narrow branches C C there being a space between them sufiicientlv great for a man to stand and work. The upper end of this space is bounded by two inclined walls C -C so that the coal or similar material will be gradually deflected into the two branches of the screen. In order that this deflection or guiding of the coal ma-v be assisted the upper surface of the two branch screens is outwardly inclined as at C*C, being a slight drop from the flat level screen surface shown at C. After the material has gotten well going on the two branches of the screen. it is not necessary to have the inclined surfaces and the screen surfaces. are again horizontal as indicated in Fig. 5. there being a sudden drop of a short distance between the high portions of the inclined screen and the level screen as indicated at C.

In the form which I have illustrated there are three separate screening portions in the general screen plan, the first one at B in the broad screen portion before the branches are reached, the second at D D in each of the two screen branches. After the coal has passed over the second screen, the picking will be substantially finishedand the screen branches will discharge into the main broad screen or conveyor by which the coal is carried away to be discharged into the chutes D D which take the fine and the coarse particles respectively.

It will be evident that I have shown in my drawings an operative device, .still many changes might be made both in size, shape and arrangement without departing from the spirit of my invention, and I wish therefore that my drawings betaken as in a sense, diagrammatic.

The use and operation of my invention are as follows:

The coal is fed down to the conveyer and screen as shown. As itcomes on the screen it passes over the open screen floor and much of the fines will have'an opportunity to pass through leaving the coal in a relatively clean condition. This partly separated coal then passes on across a smooth continuous surface being divided into two or more separate streams by the separate branch arrangement as shown and the pickers who will stand on both sides of each branch of the screen will be able to pick out rock, refuse and the like owing to the fact that the branches are narrow enough for the picker to reach in to do his work. This work, of course, is made easier by the fact that much of the fine material which would otherwise interfere with the picking has already been screened out as above indicated.

The coal passes On down through the various branches to the next screen opening and since the coal will have been more or less disturbed by the picking and by the movement, more of the fine material will have an oportunity to pass down through the screen to join the material. from the screen above. The two streams of material then pass on carried by the movement of the screen until they are discharged through the separate chutes as shown, one of which takes the fine, the other of which takes the coarse coal.

I have not indicated or discussed the treatment of the refuse picked out. Any suitable conveyers can be provided for this refuse, and they form no part of my invention. i r

In the modified form which I have illustrated more or less diagrammatically the up- 'eration of the screen.

directions the screen assembly will be counterbalanced and less power Wlll be requlred, and less vibration will result from the op I claim:

1. A. pickingtable having at both ends relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel, there being sufficient space between the narrow surfaces to permit an operator to standand work between them.

2. rkpicking table having at both ends relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel, there being suflicient space between the narrow surfaces to permit an operator to stand and work between them, means for reciprocating said table to convey material therealong, the space between the separate narrow portions being open so that the operator may stand between them and not be interfered with by the reciprocation of the table.

3. A picking table comprising a relatively wid conveying surface and means for conveying material thereto, a plurality of relatively narrow conveying branches diverging from said wide portion, the surfaces of said branches where they diverge being downwardly and outwardly inclined to assist in guiding the material.

4. A picking table comprising a relatively wide conveying surface and means for conveying material thereto, a plurality of rela tively narrow conveying branches diverging from said wide portion, the surfaces of said branches where they diverge being downwardly and outwardly inclined to assist in guiding the material, the branches after divergence being parallel one with the other, their surface where they are parallel being substantially level.

5. A picking table comprising a relatively wide conveying surface and means for conveying material thereto, a plurality of relatively narrow conveying branches diverging from said wide portion, the surfaces of said branches where they diverge being downwardly and outwardly inclined to assist in guiding the material there being a sudden change in level at the boundary line between the inclined and the level conveying surfaces.

(3. A picking table comprising a relatively wide conveying surface and means for conveying material thereto, a plurality of relatively narrow conveying branches diverging from said wide portion, the surfaces of said branches where they diverge being downwardly and outwardly inclined to assist in guiding thematerial, the branches after divergence being parallel one with the other, their surface Where they are parallel being substantially level, there being a sudden change in level at the boundary line between the inclined and the level conveying surfaces.

7. A picking table having at both ends single relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel, a screen member in the conveying surface, and a conveying platform beneath the first mentioned platform and adapted to catch and convey the material which passes through the screen.

8. A picking table having at both ends relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel, there being sufficient space between the narrow surfaces to permit an operator to stand and work be tween them, a screen member in the conveying surface, and a conveying platform beneath the first mentioned platform and adapted to catch and convey the material which passes through the screen.

.9. A picking table having at both ends relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel, means for reciprocating said table to convey material therealong, a screen member in the conveying surface and a conveying platform beneath the first mentioned platform and adapted to catch and convey the material which passes through the screen.

10. A picking table having at both ends relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel, there being sufficient space between the narrow surfaces to permit an operator to stand and work between them, means for reciprocating said table to convey material therealong, the space between the separate narrow portions being open so thatthe operator may stand between them and not be interfered with by the reciprocation.

of the table, a screen member in the conveying surface, and a conveying platform beneath the first mentioned platform and adapted to catch and convey the material which passes through the screen.

11. A picking table having at both ends relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel, a plurality of screening surfaces in the upper conveying surface, at least one of them in the wide portion and at least one of them in the branch portion and alower conveying member adapted to catch and convey the material which passes through said screen.

12. A picking table having at both ends relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel, there being suflicient space between the narrow surfaces to permit an operator to stand and work between them, a plurality of screening surfaces in the upper conveying surface at least one of them in the wide portion and at least one of them in the branch portion and a lower conveying member adapted to catch and convey the material which passes through said screen.

13. A picking table having at both ends relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel means for reciprocat- 'ing said table to convey material therealong, a plurality of screening surfaces in the upper conveying surface at least one of them in the wide portion and at least one of them in the branch portion and a lower conveying member adapted to catch and convey the material which passes through said screen.

14. A picking table having at both ends relatively wide conveying surfaces and intermediate such wide surfaces having a plurality of separate narrow conveying surfaces arranged in parallel, there being sufiicient space between the narrow surfaces to permit an operator to stand and work between them, means for reciprocating said table to convey material therealong, the space be: tween the separate narrow portions being open so that the operator may stand between them and not be interfered with by the re-- ciprocation of the table, a plurality of screening surfaces in the upper conveying surface, at least one of them in the wide portion and at least one of them in the branch portion and a, lower conveying member adapted to catch and convey the material which passes through said screen.

15. A picking table having at both ends, single, relatively wide conveying surfaces, and. intermediate such wide surfaces, and connecting them, a plurality of separate, narrow, conveying surfaces. each having space at either side sufficient to permit an operator to stand and work.

'16. A picking table having at both ends, single. relatively wide conveying surfaces, and, intermediate such wide surfaces, and connecting them, a plurality of separate narrow. conveying surfaces, each having space at either side sufficient to permit an operator to stand and work and means for reciprocating said table to convey material therealong.

Signed at Chicago county of Cook and State of Illinois, this 16th day of April 1920.

RAYMOND G. LAWRY. 

